title: Nitro-phenylalanine: a novel sensor for heat transfer in peptides.
abstract: Femtosecond IR-pump-IR-probe experiments with independently tunable pulses are used to monitor the ultrafast response of selected IR absorption bands to vibrational excitation of other modes of Fmoc-nitrophenylalanine. The absorptions of both NO(2)-bands change rapidly within <2 ps upon excitation of other vibrational modes. The results point to considerable coupling between the monitored NO(2) modes and the initially excited modes or low-frequency modes. The latter are populated by a rapid energy redistribution process. The strong IR absorption of the NO(2) stretching bands and the intense coupling to other modes makes the nitro group of nitrophenylalanine a sensitive monitor for vibrational energy arriving at this amino acid.
authors.affiliation: BioMolekulare Optik and Center for Integrated Protein Science (Munich), Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 München, Germany.
authors.forename: Karin
authors.initials: K
authors.lastname: Haiser
authors.forename: Florian O
authors.initials: FO
authors.lastname: Koller
authors.forename: Markus
authors.initials: M
authors.lastname: Huber
authors.forename: Nadja
authors.initials: N
authors.lastname: Regner
authors.forename: Tobias E
authors.initials: TE
authors.lastname: Schrader
authors.forename: Wolfgang J
authors.initials: WJ
authors.lastname: Schreier
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Zinth
mesh_terms: D004735:Energy Transfer; D006358:Hot Temperature; D010455:Peptides / Q000737:chemistry*; D010649:Phenylalanine / Q000031:analogs & derivatives*; D013055:Spectrophotometry, Infrared / Q000295:instrumentation*; D014732:Vibration
chemical_list: D010455:Peptides; C040239:4-nitrophenylalanine; D010649:Phenylalanine